I understand misgivings about crossdressing, or any other unusual lifestyle for that matter. But throwing up is really over the top.

I have been wary of committed relationships, CD notwithstanding, simply because I don't want to wake up one day and find that the woman I love to the point of complete support and devotion might not return the favour.

Sure you can stop wearing women's clothes, just as you can stop any other behaviour. You can do that fine without the help of a therapist. But it's not in a therapists power, or even your power to change your personality, and your wife should realise this. Does she want to change your personailty?